CA1245746A - Controlled-access apparatus for the agricultural food industries - Google Patents
Controlled-access apparatus for the agricultural food industriesInfo
- Publication number
- CA1245746A CA1245746A CA000465051A CA465051A CA1245746A CA 1245746 A CA1245746 A CA 1245746A CA 000465051 A CA000465051 A CA 000465051A CA 465051 A CA465051 A CA 465051A CA 1245746 A CA1245746 A CA 1245746A
- Authority
- CA
- Canada
- Prior art keywords
- detector
- vessel
- vicinity
- access
- detecting means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 235000013305 food Nutrition 0.000 title claims abstract description 29
- 230000004224 protection Effects 0.000 claims abstract description 22
- 239000004615 ingredient Substances 0.000 claims abstract description 12
- 235000012041 food component Nutrition 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims description 11
- 230000010355 oscillation Effects 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000005684 electric field Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 208000029152 Small face Diseases 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 claims 1
- 230000006378 damage Effects 0.000 abstract description 6
- 230000002633 protecting effect Effects 0.000 abstract description 5
- 230000035515 penetration Effects 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 8
- 208000027418 Wounds and injury Diseases 0.000 description 5
- 208000014674 injury Diseases 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229940086255 perform Drugs 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/60—Safety arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Food-Manufacturing Devices (AREA)
- Hydroponics (AREA)
- General Preparation And Processing Of Foods (AREA)
- Safety Devices In Control Systems (AREA)
- Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In a controlled-access apparatus for agricultural food industries, means is provided within the space located between the rotary tool-hol-der and the edge of the opening of the vessel of the apparatus for a protection and access-control device which performs a double function, namely that of protecting the user against accidental bodily injuries and that of allowing penetration of/or access to agricultural food products or ingredients, utensils or instruments having predetermined characteristics such as zero electrical conductivity and nonmagnetic properties.
In a controlled-access apparatus for agricultural food industries, means is provided within the space located between the rotary tool-hol-der and the edge of the opening of the vessel of the apparatus for a protection and access-control device which performs a double function, namely that of protecting the user against accidental bodily injuries and that of allowing penetration of/or access to agricultural food products or ingredients, utensils or instruments having predetermined characteristics such as zero electrical conductivity and nonmagnetic properties.
Description
~S7~6 A CONTROLLED-ACCESS APPARATUS FOR THE
AGRICULTURAL FOOD INDUSTRIES
Background of the invention Field of the invention .
The present inven-tion relates to a controlled-access apparatus for the agricultural food industries.
D c~ tion of the prior art Known equipnlent for agricultural food inclustries such as mixing or kneading machines having stationary or rotary vessels are often provided with a safety device for preventing access to the vessel during opera-tion. This safety device is usually a mechanical device which closes the space between the rotary tool-holder and the edge of the vessel opening.
This safety device is often constituted either by a metal grid or by a solid screen which can be opaque or transparent. This mechanical safety device has proved effective up to the present -time for protecting the user against accidental bodily injuries but is attended by a disad vantage, however, in the preparation of agricultural food products. In fact, some agricultural food products require constant supervision of ,~
~Z9~7~6 the state of products being prepared or control of the degree of their evolution or else call for the addition of other products or ingredients during operation of equipment units and in predetermined stages of operation whereas the presence of this mechanical safety device hinders or prevents this supervision or introduction of products or ingredients.
Furthermore, this mechanical safety device which is designed in the form of a grid or element having a complicated structure is not readily conducive easy maintenance of hygiene which is essential in the case of equipment employed in agricultural food industries.
In machine-tools such as presses, electronic protection systems - already exist that delimit a field of protection about dangerous opera-ting parts and actuate the shutting-down of these machines once the operator's hand or any object crosses the protection field. These known electronic systems are highly suitable for these presses or machine-tools, given that the operations carried out by them such as stamping, swaging, etc. of a metal sheet do not require any further human inter-vention during operation in order to achieve a desired result, as in the case of preparing agricultural products, as recalled in the preceding paragraph, in an apparatus for the agricultural food industries such as a mixer or kneading machine. On the other hand, these known electronic protection systems present in the equipment for the agricultural food industries, the same drawbacks as those indicated herein-above of a mechanical safety device since these protection systems actuate the shut-down of this equipment once the instruments or the utensils used in :~2~5~
a control of the degree of evolution of the produc~ in preparation or the ingredients that must be added to these products in preparation, cross the field of protection developed by these systems.
Summary of the invention The aim oF the present invention is to overcome these disadvan-tages by providing an apparatus for agricultural food industries which is provided with a protection and access-control device which is economi-cal, efficient, and easy to maintain from a hygienic standpoint.
This device carries out an adjustable selectivity of the bodies in order to allow to pass those which are authorized and to actuate the - shutting-down of the apparatus upon arrival of those bodies which are forbidden.
In accordance with the invention, a controlled-access apparatus for agricultural food industries is mainly distinguished by the fact that provision is made within the space located between the rotary tool-holder and the edge of the opening of the vessel of said apparatlls for a protection and access-control device through selectivity of bodies which performs a double function, namely that of protecting the user against accidental bodily injuries and that of allowing penetration or access of agricultural food products or ingredients, utensils or instru-ments having predetermined characteristics such as zero electrical conductivity and nonmagnetic properties.
Brief description of the drawings Other features of the invention will be more apparent upon consi-deration of the following description and accompanying drawings, wherein:
~2~ 6 - figure 1 is a block diagram of a mixer for agricultural food industries, said mixer being provided with a protec-tion and access-control device in one embodiment of the invention;
- figure 2 is a partial electrical diagram of the apparatus of figure 1, showing a stage of oscillators of the electrical assembly of the protection device and access control;
- figure 3 represents a partial electrical diagram of the apparatus of figure 1, showing an electric supply -- circuit of the mixer of figure l;
- figure 4 is a partial schematic view of one exemplified embodiment oF the apparatus of figure 1;
- figure 5 is a partial schematic view oF another exemplified elnbodinlen-t oF the apparatus of figure 1.
Description of the preferred embodiments -An apparatus for agricultural food industries such as controlled-access mixer 1 as represented schematically by a rectangle in Figure 1 comprises a device 2 which constitutes in conjunction with the frame and vessel of the mixer 1 a combination which makes it possibl~ to per-Form two functions in this apparatus. The first function consists in protec-ting tlle user against accidental bodily injuries caused by rotating parts of the apparatus when this latter is in operation, this being achieved by cutting-off the supply of electric current to the motor employed for driving the apparatus, in other words by actuating a ~Z~5~
shut-down of the f~nctioning of the apparatus, assoon as the user or part of his body is located at a predetermined and adjustable distance from the rotating portions of the apparatus. The secqnd function consists in controlling the access to this apparatus, in particular to the vessel which contains the products to be subjected to a predetermined food-pro-duct preparation process and in which the work tool of the apparatus is rotatably mounted. This control operation consists in permitting free access to said vessel only by agricultural food products or ingredients and preparation instruments or utensils having certain predetermined characteristics without acting on the operation of the apparatus.
- In the example illustrated in figure 1, the protection and access-control device 2 comprises an element developing an electric field 3 hereinafter designated as a detec-tor 3 which is placed within the space between the rotary tool-holder of the mixer 1 and the edge of the openiny of the mixing vessel ~ in order to form arl inllllaterial screen for protecting and controlling the access to said space. The detector 3 can be constituted by the sensitive element of an electrical assembly of a known type having an oscillator stage 5 and stage with an electromag-netic relay 6 which usually serves as an alarm device: as the user moves toward or away (i.e. the presence or the absence) from the alarm device, the impedance of the oscillator s-tage 5 is modified, thus producing respectively a break-off or restoration of the oscillation, thereby causing energization or de-energization of the relay stage 6. This device can further comprise a power supply circuit 7 which is connected to an electric current source 8 via a switch 9.
.
7~
Oscillator stage 5 comprises a transistor 25 the base of which is polarized by a voltage divider c~nstituked by two resistances 26j27 connected in series to the terminal of the pcwer supply circuit 7 and provided with ~ decoupling capacitance 28. An ost:illa~or circuit 29 constituted by an adjustable inductance 30 and a capacitor31 in parallel is mounted on the collector of the transistor 25 in series with decoupling cell comprising a resistance 32 and a capacitance 33. The detector is connected to a point 39 situated between the oscillator circuit 29 and the collector of the transistor 25 through the conduc-tor 18. ThP circuit of the emitter of the transistor 25 comprises a resistance 34 and capacitances 35, 36. The controlsignal of the electromagnetic relay stage 6 is transmitted through capacitance 35, 36. A variab:le capacitance 37 mount~d between the emitter and th~
collector of the transistor 25 allows by its adjustment to control the operating point of oscillator 5, i.e.
the restoration and break-off limit points of oscillator 5 at the selected impedance variations detected by the oscillator stage 5 provoked by the 2C presence of bodies the passage of which is or is not a~thorized in the field of protection developed by the protection and access-control device 2. These limits are determined so that the bodies whose passage is authorized, such as instruments or preparation utensils having preselected physical characteristics or the additional products or ingredients only provoke impedance variations detected by the oscillator stage 5 7~
lower than these limits while ~he bodies whose passage is forbidden, such as the human body or a member thereof, only provoke impedance variations detected by a the oscillator stage 5 higher than these limits.
_ -.7a -~2~57~
When the oscillation occurs in oscillator stage 5, a current that appears at the terminals o~ resistance 34, is transmitted through the capacitance 36 to the electromagnetic relay stage 6 in order to deter-mine a non-excitation of the relay and consequently normal operation of the mixer. Once break-off of the oscîllator occurs, the voltageat the terminals of the resistance 34 is cut off, tnereby provoking excitation of the relay stage 6 which actuates the shut-down of the mixer.
In the example given, the function of the relay of stage 6 of the electrical assembly of the protection and access-control device 2 is to initiate starting or stopping of a motor 10 for driving the mixer 1 - (shown in Fig. 1) via a known contactor 11 of the self-energizing type (shown in Fig. 3). By way of example, the motor 10 is a three-phase motor supplied from a three phase power supply system Ll, L2, L3, T. In mixer 1, the devicc 2 stops the operation as soon as the user enters the pre-set forbidden zone developed by the detector 3. On the other hand, said device 2 allows access to the mixing vessel ~ by the agricultural food products or ingredients and by the preparation utensils or instr-lments which are not electrically conductive or nonmetallic and nonmagnetic.
It is ensured that the user is protected against accidental bodily injuries while being permitted to carry out the task of supervising, controlling and freely performing remote preparations by means of instruments which are nôt electrically conductive, are nonmagnetic and have an adequate length, and of freely introducing into the vessel ~ of the mixer 1 the products or ingredients contained in nonconductive and ~LZ~;7~i nonmetalljc utensils without disturbing the operation of said mixer 1.
In an example which is illustrated in Fig. 4, the detector 3 is designed in the form of a U-shaped rod or wire and is placed within the space between the tool-holder 12 and the edge of the opening of the mixing vessr-~l 4 and fixed on a shaft 13 which i5 pivotally mounted on the frame of the mixer 1. The detector 3 is provided with stops which determine its rest position (not shown) and its operating position as shown in Fig. 4.
In the example illustrated, the detector 3 comprises a front stop 14 which, in the operating position of the detecto~ rests on the edge of - the mixing vessel 4. There is also fixed on the pivotal shaft 13 of the detector 3 a cam 15 for causing the power supply switch 9 of the electri-cal assemhly comprising an oscillator stage 5 and a relay stage 6 to close when the let~ctor in the oper~ting position shown in Fig. ~ and for causing said switch 9 to open when the detector 3 is in the rest position (not shown). The small faces 16 and 17 of -the cam 15 can constitute stops which determine the degree of pivotal displacement of the detector 3 or its inactive and operating positions. The detector 3 is preferably connected to the electrical assembly comprising the oscillator stage 5 and a relay stage 6 of the device 2 by means of a coaxial cable shown as a dashed line 18.
In another example shown in Fig. 5, the detector 3 is fixed and mounted on the frame of the mixer 1 whilst the cam 15 which controls the closing and opening of the switch 9 is fixed on a shaft 19 pivotally mounted on the frame of the mixer 1. A stop 20 is also -Fixed on the ~L2~7~
shaft 19 in order to initiate closing of the switch 9 in conjunction with the cam 15 as soon as said stop 20 comes to rest on the vessel 4 of the mixer 1. The stop 14 (shown in Fig. 4) and the stop 20 (shown in Fig. 5) are provided with a number of shouldered portions which enable them to rest correctly on the edges of the openings of various types of vessels 4 which have different pre-determined dimensions and are adapted to the preparations performed by the mixer 1.
The detector 3 has a simple shape and structure and is easy to maintain in order to achieve the essential standard of hygiene in equipment for agricultural food industries. The detector 3 can have any - shape other than the U-shape shown in the drawings.
In an example which has not been illustrated, the detector 3 is mounted in the frame of the mixer 1 within the portion 21 (shown in Figs. 4 and 5), which surrounds the tool-holder 12. In order to provide -the detector with its maximunl degree of efficiency, the external wall of the portion 21 and the portion of the frame located in the vicinity of said detector is formed of electrically nonconductive and nonmagnetic material or of material which does not afford any resistance to the efficiency of the detector 3 ~Cil de~elop on elect~c field vithin the deli~ted zone 1V1^a'Ch -the user is forbi~len to en-ter and w1 ich is located be-hveen the tool-~kler 12 and the ed~e of the o~ of the ~sel ~ of ~ ,~xer 1.
In the apparatus 1 for agricultural food industries, the U-shaped wire detector 3 provides the user with large and free available spaces which permit each access to the vessel 4 in which the work tool is rotably mounted, by means of electrically nonconductive and nonmagnetic instruments. The zone which the user is forbidden to enter and which extends over the space between the tool-holder 12 and the edge of the opening of the mixing vessel 4 is made adjustable in known manner by means of the electrical assembly which comprises the oscillator stage 5 and the relay stage 6 and to which the detector 3 is connected.
The device in accordance witl- the invention for providing pro-tection and control of access to the mixer 1 offers an appreciable advantage over the known alarm or safety system although this latter has a similar structure. In both its design objective and practical application the known system has only a single function of protection - or prevention which it ensures with absolute stringency as soon as the forbidden zone delimited by the detector is violated or penetrated by the user. This single function of the system is performed by producing an alarm signal for shutting-down an installation or initiating opera-tion Or a protective device which prevents any entry or accidental bodily injury.
In contrast to this known system the con-trolled-access apparatus in accordance with the invention for agricultural food industries is not limited to the above-mentioned function of protection or prevention by means of said alarm or safety system. The additional function of the present device is to permit access or introduction of certain elements having predetermined characteristics such as electrically nonconductive or nonmagnetic properties with respect to agricultural food products or ingredients. Such elements can consist of the preparation utensils and instruments intended for use with the mixer 1 as described in the foregoing.
AGRICULTURAL FOOD INDUSTRIES
Background of the invention Field of the invention .
The present inven-tion relates to a controlled-access apparatus for the agricultural food industries.
D c~ tion of the prior art Known equipnlent for agricultural food inclustries such as mixing or kneading machines having stationary or rotary vessels are often provided with a safety device for preventing access to the vessel during opera-tion. This safety device is usually a mechanical device which closes the space between the rotary tool-holder and the edge of the vessel opening.
This safety device is often constituted either by a metal grid or by a solid screen which can be opaque or transparent. This mechanical safety device has proved effective up to the present -time for protecting the user against accidental bodily injuries but is attended by a disad vantage, however, in the preparation of agricultural food products. In fact, some agricultural food products require constant supervision of ,~
~Z9~7~6 the state of products being prepared or control of the degree of their evolution or else call for the addition of other products or ingredients during operation of equipment units and in predetermined stages of operation whereas the presence of this mechanical safety device hinders or prevents this supervision or introduction of products or ingredients.
Furthermore, this mechanical safety device which is designed in the form of a grid or element having a complicated structure is not readily conducive easy maintenance of hygiene which is essential in the case of equipment employed in agricultural food industries.
In machine-tools such as presses, electronic protection systems - already exist that delimit a field of protection about dangerous opera-ting parts and actuate the shutting-down of these machines once the operator's hand or any object crosses the protection field. These known electronic systems are highly suitable for these presses or machine-tools, given that the operations carried out by them such as stamping, swaging, etc. of a metal sheet do not require any further human inter-vention during operation in order to achieve a desired result, as in the case of preparing agricultural products, as recalled in the preceding paragraph, in an apparatus for the agricultural food industries such as a mixer or kneading machine. On the other hand, these known electronic protection systems present in the equipment for the agricultural food industries, the same drawbacks as those indicated herein-above of a mechanical safety device since these protection systems actuate the shut-down of this equipment once the instruments or the utensils used in :~2~5~
a control of the degree of evolution of the produc~ in preparation or the ingredients that must be added to these products in preparation, cross the field of protection developed by these systems.
Summary of the invention The aim oF the present invention is to overcome these disadvan-tages by providing an apparatus for agricultural food industries which is provided with a protection and access-control device which is economi-cal, efficient, and easy to maintain from a hygienic standpoint.
This device carries out an adjustable selectivity of the bodies in order to allow to pass those which are authorized and to actuate the - shutting-down of the apparatus upon arrival of those bodies which are forbidden.
In accordance with the invention, a controlled-access apparatus for agricultural food industries is mainly distinguished by the fact that provision is made within the space located between the rotary tool-holder and the edge of the opening of the vessel of said apparatlls for a protection and access-control device through selectivity of bodies which performs a double function, namely that of protecting the user against accidental bodily injuries and that of allowing penetration or access of agricultural food products or ingredients, utensils or instru-ments having predetermined characteristics such as zero electrical conductivity and nonmagnetic properties.
Brief description of the drawings Other features of the invention will be more apparent upon consi-deration of the following description and accompanying drawings, wherein:
~2~ 6 - figure 1 is a block diagram of a mixer for agricultural food industries, said mixer being provided with a protec-tion and access-control device in one embodiment of the invention;
- figure 2 is a partial electrical diagram of the apparatus of figure 1, showing a stage of oscillators of the electrical assembly of the protection device and access control;
- figure 3 represents a partial electrical diagram of the apparatus of figure 1, showing an electric supply -- circuit of the mixer of figure l;
- figure 4 is a partial schematic view of one exemplified embodiment oF the apparatus of figure 1;
- figure 5 is a partial schematic view oF another exemplified elnbodinlen-t oF the apparatus of figure 1.
Description of the preferred embodiments -An apparatus for agricultural food industries such as controlled-access mixer 1 as represented schematically by a rectangle in Figure 1 comprises a device 2 which constitutes in conjunction with the frame and vessel of the mixer 1 a combination which makes it possibl~ to per-Form two functions in this apparatus. The first function consists in protec-ting tlle user against accidental bodily injuries caused by rotating parts of the apparatus when this latter is in operation, this being achieved by cutting-off the supply of electric current to the motor employed for driving the apparatus, in other words by actuating a ~Z~5~
shut-down of the f~nctioning of the apparatus, assoon as the user or part of his body is located at a predetermined and adjustable distance from the rotating portions of the apparatus. The secqnd function consists in controlling the access to this apparatus, in particular to the vessel which contains the products to be subjected to a predetermined food-pro-duct preparation process and in which the work tool of the apparatus is rotatably mounted. This control operation consists in permitting free access to said vessel only by agricultural food products or ingredients and preparation instruments or utensils having certain predetermined characteristics without acting on the operation of the apparatus.
- In the example illustrated in figure 1, the protection and access-control device 2 comprises an element developing an electric field 3 hereinafter designated as a detec-tor 3 which is placed within the space between the rotary tool-holder of the mixer 1 and the edge of the openiny of the mixing vessel ~ in order to form arl inllllaterial screen for protecting and controlling the access to said space. The detector 3 can be constituted by the sensitive element of an electrical assembly of a known type having an oscillator stage 5 and stage with an electromag-netic relay 6 which usually serves as an alarm device: as the user moves toward or away (i.e. the presence or the absence) from the alarm device, the impedance of the oscillator s-tage 5 is modified, thus producing respectively a break-off or restoration of the oscillation, thereby causing energization or de-energization of the relay stage 6. This device can further comprise a power supply circuit 7 which is connected to an electric current source 8 via a switch 9.
.
7~
Oscillator stage 5 comprises a transistor 25 the base of which is polarized by a voltage divider c~nstituked by two resistances 26j27 connected in series to the terminal of the pcwer supply circuit 7 and provided with ~ decoupling capacitance 28. An ost:illa~or circuit 29 constituted by an adjustable inductance 30 and a capacitor31 in parallel is mounted on the collector of the transistor 25 in series with decoupling cell comprising a resistance 32 and a capacitance 33. The detector is connected to a point 39 situated between the oscillator circuit 29 and the collector of the transistor 25 through the conduc-tor 18. ThP circuit of the emitter of the transistor 25 comprises a resistance 34 and capacitances 35, 36. The controlsignal of the electromagnetic relay stage 6 is transmitted through capacitance 35, 36. A variab:le capacitance 37 mount~d between the emitter and th~
collector of the transistor 25 allows by its adjustment to control the operating point of oscillator 5, i.e.
the restoration and break-off limit points of oscillator 5 at the selected impedance variations detected by the oscillator stage 5 provoked by the 2C presence of bodies the passage of which is or is not a~thorized in the field of protection developed by the protection and access-control device 2. These limits are determined so that the bodies whose passage is authorized, such as instruments or preparation utensils having preselected physical characteristics or the additional products or ingredients only provoke impedance variations detected by the oscillator stage 5 7~
lower than these limits while ~he bodies whose passage is forbidden, such as the human body or a member thereof, only provoke impedance variations detected by a the oscillator stage 5 higher than these limits.
_ -.7a -~2~57~
When the oscillation occurs in oscillator stage 5, a current that appears at the terminals o~ resistance 34, is transmitted through the capacitance 36 to the electromagnetic relay stage 6 in order to deter-mine a non-excitation of the relay and consequently normal operation of the mixer. Once break-off of the oscîllator occurs, the voltageat the terminals of the resistance 34 is cut off, tnereby provoking excitation of the relay stage 6 which actuates the shut-down of the mixer.
In the example given, the function of the relay of stage 6 of the electrical assembly of the protection and access-control device 2 is to initiate starting or stopping of a motor 10 for driving the mixer 1 - (shown in Fig. 1) via a known contactor 11 of the self-energizing type (shown in Fig. 3). By way of example, the motor 10 is a three-phase motor supplied from a three phase power supply system Ll, L2, L3, T. In mixer 1, the devicc 2 stops the operation as soon as the user enters the pre-set forbidden zone developed by the detector 3. On the other hand, said device 2 allows access to the mixing vessel ~ by the agricultural food products or ingredients and by the preparation utensils or instr-lments which are not electrically conductive or nonmetallic and nonmagnetic.
It is ensured that the user is protected against accidental bodily injuries while being permitted to carry out the task of supervising, controlling and freely performing remote preparations by means of instruments which are nôt electrically conductive, are nonmagnetic and have an adequate length, and of freely introducing into the vessel ~ of the mixer 1 the products or ingredients contained in nonconductive and ~LZ~;7~i nonmetalljc utensils without disturbing the operation of said mixer 1.
In an example which is illustrated in Fig. 4, the detector 3 is designed in the form of a U-shaped rod or wire and is placed within the space between the tool-holder 12 and the edge of the opening of the mixing vessr-~l 4 and fixed on a shaft 13 which i5 pivotally mounted on the frame of the mixer 1. The detector 3 is provided with stops which determine its rest position (not shown) and its operating position as shown in Fig. 4.
In the example illustrated, the detector 3 comprises a front stop 14 which, in the operating position of the detecto~ rests on the edge of - the mixing vessel 4. There is also fixed on the pivotal shaft 13 of the detector 3 a cam 15 for causing the power supply switch 9 of the electri-cal assemhly comprising an oscillator stage 5 and a relay stage 6 to close when the let~ctor in the oper~ting position shown in Fig. ~ and for causing said switch 9 to open when the detector 3 is in the rest position (not shown). The small faces 16 and 17 of -the cam 15 can constitute stops which determine the degree of pivotal displacement of the detector 3 or its inactive and operating positions. The detector 3 is preferably connected to the electrical assembly comprising the oscillator stage 5 and a relay stage 6 of the device 2 by means of a coaxial cable shown as a dashed line 18.
In another example shown in Fig. 5, the detector 3 is fixed and mounted on the frame of the mixer 1 whilst the cam 15 which controls the closing and opening of the switch 9 is fixed on a shaft 19 pivotally mounted on the frame of the mixer 1. A stop 20 is also -Fixed on the ~L2~7~
shaft 19 in order to initiate closing of the switch 9 in conjunction with the cam 15 as soon as said stop 20 comes to rest on the vessel 4 of the mixer 1. The stop 14 (shown in Fig. 4) and the stop 20 (shown in Fig. 5) are provided with a number of shouldered portions which enable them to rest correctly on the edges of the openings of various types of vessels 4 which have different pre-determined dimensions and are adapted to the preparations performed by the mixer 1.
The detector 3 has a simple shape and structure and is easy to maintain in order to achieve the essential standard of hygiene in equipment for agricultural food industries. The detector 3 can have any - shape other than the U-shape shown in the drawings.
In an example which has not been illustrated, the detector 3 is mounted in the frame of the mixer 1 within the portion 21 (shown in Figs. 4 and 5), which surrounds the tool-holder 12. In order to provide -the detector with its maximunl degree of efficiency, the external wall of the portion 21 and the portion of the frame located in the vicinity of said detector is formed of electrically nonconductive and nonmagnetic material or of material which does not afford any resistance to the efficiency of the detector 3 ~Cil de~elop on elect~c field vithin the deli~ted zone 1V1^a'Ch -the user is forbi~len to en-ter and w1 ich is located be-hveen the tool-~kler 12 and the ed~e of the o~ of the ~sel ~ of ~ ,~xer 1.
In the apparatus 1 for agricultural food industries, the U-shaped wire detector 3 provides the user with large and free available spaces which permit each access to the vessel 4 in which the work tool is rotably mounted, by means of electrically nonconductive and nonmagnetic instruments. The zone which the user is forbidden to enter and which extends over the space between the tool-holder 12 and the edge of the opening of the mixing vessel 4 is made adjustable in known manner by means of the electrical assembly which comprises the oscillator stage 5 and the relay stage 6 and to which the detector 3 is connected.
The device in accordance witl- the invention for providing pro-tection and control of access to the mixer 1 offers an appreciable advantage over the known alarm or safety system although this latter has a similar structure. In both its design objective and practical application the known system has only a single function of protection - or prevention which it ensures with absolute stringency as soon as the forbidden zone delimited by the detector is violated or penetrated by the user. This single function of the system is performed by producing an alarm signal for shutting-down an installation or initiating opera-tion Or a protective device which prevents any entry or accidental bodily injury.
In contrast to this known system the con-trolled-access apparatus in accordance with the invention for agricultural food industries is not limited to the above-mentioned function of protection or prevention by means of said alarm or safety system. The additional function of the present device is to permit access or introduction of certain elements having predetermined characteristics such as electrically nonconductive or nonmagnetic properties with respect to agricultural food products or ingredients. Such elements can consist of the preparation utensils and instruments intended for use with the mixer 1 as described in the foregoing.
Claims (10)
1. A controlled-access apparatus for an agricultural food apparatus having a vessel with an opening and a tool-holder, comprising:
- means provided within a space located between the tool-holder and an edge of the opening of the vessel of said apparatus, for detecting a characteristic of an object located in the vicinity of the detecting means, and producing a signal indicative thereof; and - protection means for selectively acting on the food apparatus allowing agricultural food products or ingredients, utensils and instruments located in the vicinity of the detecting means and which produce impedance variations lower than predetermined limits to be located in the vicinity of said apparatus without acting on the operation of the apparatus, and shutting off the apparatus when objects which produce impedance variations higher than said predefined limits are detected in the vicinity of the detecting means, said predefined limits chosen so that a member of a human body will shut off said apparatus.
- means provided within a space located between the tool-holder and an edge of the opening of the vessel of said apparatus, for detecting a characteristic of an object located in the vicinity of the detecting means, and producing a signal indicative thereof; and - protection means for selectively acting on the food apparatus allowing agricultural food products or ingredients, utensils and instruments located in the vicinity of the detecting means and which produce impedance variations lower than predetermined limits to be located in the vicinity of said apparatus without acting on the operation of the apparatus, and shutting off the apparatus when objects which produce impedance variations higher than said predefined limits are detected in the vicinity of the detecting means, said predefined limits chosen so that a member of a human body will shut off said apparatus.
2. An apparatus according to claim 1, wherein the detecting means comprises a detector which develops an electric field, and which is located within a space between the tool-holder and the edges of the opening of the vessel and wherein said protection means includes (1) oscillating means for allowing the passage of agricultural food products and ingredients, predetermined preparation utensils and instruments to be located in the vicinity of the detecting means if they produce electric impedance variations lower than said predetermined limits, said predetermined limits being limits of interrupting an oscillation of the oscillating means, thereby allowing their access to the vessel without acting on the operation of the apparatus, and for turning off the oscillation of the oscillator when at least one of a member of a human body and objects which produce electric impedance variations higher than said predefined limits are located in the vicinity of the detecting means, and (2) relay means for interrupting the supply of current to the drive motor of the apparatus when the break-off of the oscillation occurs.
3. An apparatus according to claim 2, wherein the detector has a U-shaped single-wire structure and is fixed on a shaft pivotally mounted on the frame of the food apparatus to have one rest position and one work position.
4. An apparatus according to claim 2, wherein the detector is placed in the frame of an apparatus within the portion which surrounds the tool-holder and is provided with an external wall formed of material which does not afford any resistance to the developing of the electric field by said detector.
5. Apparatus as in claim 1 further comprising means for adjusting a sensitivity of said detecting means to characteristics of the object.
6. Apparatus as in claim 1 wherein said acting on operation is a shut off of said food apparatus.
7. An apparatus according to claim 2, wherein the detector is fixed on a pivotal shaft with a work position and a rest position and said protection means includes a switch which selectively couples power thereto, and further comprising cam means fixed on the pivotal shaft of the detector for closing the power supply switch when the detector is in the work position, and for opening the power supply switch when said detector is in the rest position.
8. An apparatus according to claim 2, wherein the detector is fixed on the frame of the apparatus and said protection means includes a switch which selectively couples power thereto, and, further comprising operating means, including a cam and a stop fixed on a shaft which is pivotally mounted on the frame of the apparatus to have a work position and a rest position, for closing of the power supply switch when said stop is returned to its work position and rests on the edge of the vessel of the apparatus, and for opening the power supply switch when the stop is returned to its rest position in a movement of pivotal displacement.
9. An apparatus according to claim 7, wherein the detector comprises a front stop which rests on the edge of the vessel of the apparatus when the detector is located in the operating position.
10. An apparatus according to claim 7 or claim 8, wherein the cam comprises small faces which serve as stops for limiting the degree of pivotal displacement of said cam.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8316387A FR2553299A1 (en) | 1983-10-14 | 1983-10-14 | APPARATUS FOR FOOD INDUSTRIES WITH ACCESS CONTROLLED BY A DEVICE CREATING A VARIATION IN ELECTRIC IMPEDANCE |
| FR8316387 | 1983-10-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1245746A true CA1245746A (en) | 1988-11-29 |
Family
ID=9293149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000465051A Expired CA1245746A (en) | 1983-10-14 | 1984-10-10 | Controlled-access apparatus for the agricultural food industries |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US4683381A (en) |
| EP (1) | EP0138702B1 (en) |
| JP (1) | JPS60151703A (en) |
| AU (1) | AU3417884A (en) |
| CA (1) | CA1245746A (en) |
| DE (1) | DE3465704D1 (en) |
| ES (1) | ES8506467A1 (en) |
| FI (1) | FI74588C (en) |
| FR (1) | FR2553299A1 (en) |
| NO (1) | NO844100L (en) |
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| FR2759301B1 (en) * | 1997-02-13 | 1999-04-30 | Denis Rouhier | SAFETY DEVICE FOR MOBILE TOOL |
| FR2771023B1 (en) * | 1997-11-20 | 1999-12-31 | Dito Sama | BATTER-MIXER TYPE MACHINE |
| US6135630A (en) * | 1998-09-02 | 2000-10-24 | Color Access, Inc. | Mixer mounting system |
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| AT520184B1 (en) * | 2017-09-18 | 2019-02-15 | Zeta Biopharma Gmbh | Stirring head with identification device |
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| US2963627A (en) * | 1957-12-03 | 1960-12-06 | American Brake Shoe Co | Electronic guard |
| US3147408A (en) * | 1961-08-07 | 1964-09-01 | Yamamoto Mititaka | Proximity switch system |
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| GB1118235A (en) * | 1965-11-23 | 1968-06-26 | Tateisi Electronics Company | A proximity switch |
| NL7112392A (en) * | 1971-09-09 | 1973-03-13 | Mixing/kneading machine - used as a high capacity dough mixer | |
| US3829850A (en) * | 1971-12-17 | 1974-08-13 | Tyco Laboratories Inc | Proximity detector |
| BE795081A (en) * | 1972-03-15 | 1973-05-29 | Kemper Kate | ELECTRICALLY CONTROLLED MIXER |
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| US3785230A (en) * | 1972-11-08 | 1974-01-15 | Lokey Tool Inc | Automatic safety brake for rotary blade equipment |
| US3896425A (en) * | 1973-10-16 | 1975-07-22 | Tyco Laboratories Inc | Proximity detector |
| US3953770A (en) * | 1974-07-11 | 1976-04-27 | Jinnosuke Hayashi | Safety equipment for machinery used in processing plates, etc. |
| US3947734A (en) * | 1974-09-06 | 1976-03-30 | The Stanley Works | Electronic personnel safety sensor |
| DE2460057B2 (en) * | 1974-12-19 | 1977-02-10 | Robert Bosch Gmbh, 7000 Stuttgart | SWITCH ARRANGEMENT WITH A STRIKE FIELD CAPACITOR |
| US3987881A (en) * | 1975-04-17 | 1976-10-26 | Perkins & Mundt Inc. | Safety guard |
| US4029996A (en) * | 1976-03-08 | 1977-06-14 | The Gillette Company | Apparatus having a protective circuit |
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| FR2463354A1 (en) * | 1979-08-14 | 1981-02-20 | Dito | Hand-guard for electric food mixer - is fixed to handle by pin jointed double arm which switches motor off when pivoted from safe position |
| US4362196A (en) * | 1980-09-24 | 1982-12-07 | Hirsh Company | Power tool table with safety shut-off |
| US4412268A (en) * | 1981-10-02 | 1983-10-25 | Dart Industries Inc. | Safety switch system for industrial machines |
| DE3209687A1 (en) * | 1982-03-17 | 1983-09-29 | Kemper, Kate, 8700 Küsnacht, Zürich | MOBILE DROP AND MIXER |
-
1983
- 1983-10-14 FR FR8316387A patent/FR2553299A1/en active Pending
-
1984
- 1984-10-04 US US06/657,523 patent/US4683381A/en not_active Expired - Fee Related
- 1984-10-08 DE DE8484402017T patent/DE3465704D1/en not_active Expired
- 1984-10-08 EP EP84402017A patent/EP0138702B1/en not_active Expired
- 1984-10-10 CA CA000465051A patent/CA1245746A/en not_active Expired
- 1984-10-11 ES ES536718A patent/ES8506467A1/en not_active Expired
- 1984-10-12 NO NO844100A patent/NO844100L/en unknown
- 1984-10-12 FI FI844021A patent/FI74588C/en not_active IP Right Cessation
- 1984-10-12 AU AU34178/84A patent/AU3417884A/en not_active Abandoned
- 1984-10-13 JP JP59215068A patent/JPS60151703A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| ES536718A0 (en) | 1985-08-01 |
| FI74588B (en) | 1987-11-30 |
| DE3465704D1 (en) | 1987-10-08 |
| FI844021A0 (en) | 1984-10-12 |
| FI844021L (en) | 1985-04-15 |
| FI74588C (en) | 1988-03-10 |
| US4683381A (en) | 1987-07-28 |
| ES8506467A1 (en) | 1985-08-01 |
| JPS60151703A (en) | 1985-08-09 |
| EP0138702A1 (en) | 1985-04-24 |
| NO844100L (en) | 1985-04-15 |
| FR2553299A1 (en) | 1985-04-19 |
| EP0138702B1 (en) | 1987-09-02 |
| AU3417884A (en) | 1985-04-18 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |